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Old 09-01-2015, 11:57 PM   #61
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Quote:
Originally Posted by good2go View Post
But wait, just the fact that there is evidence of some leakage doesn't mean it's no good. He blew on that thing for some period of time, and the total space involved was virtually none, so my guess is that an entire crankcase volume would see next to nothing from a boost event lasting the time it takes to go through a few gears, no?
I am in no rush to do anything with my valve, if that answers your question. It is much better than OEM, and isn't a bad or expensive thing while waiting for a check valve to ship. What little it leaks is probably just due to the tolerances on the plastic. If you are creative I bet it can be fixed.

Aiden drives a lot harder than I do, and breaks more things.
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Old 09-01-2015, 11:57 PM   #62
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Who knows? How much boost? Maybe it leaks worse when you apply 20 PSI instead of 0.2?

The easy simple proven way to fix this problem is install a check valve that's actually designed to see pressure levels that we turbo miata folks see.
Well, I'd expect that any self respecting MT member could must far greater than a measly 0.2, but who knows, maybe Aidan only excels at applying negative oral pressure instead.
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Old 09-02-2015, 12:16 AM   #63
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leaving this here
https://www.miataturbo.net/diy-turbo...re-test-80353/

and ignoring the retarded check valve conversation
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Old 09-02-2015, 12:17 AM   #64
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Hehe
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Old 09-02-2015, 02:24 AM   #65
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<p>I would hope that I could apply more pressure than that.</p><p>Should I hook up my 2k psi of argon to it?</p><p>I was thinking about adding a nipple to my oil cap and running a dedicated map sensor for it so I could log on the megasquirt.</p><p>tommy im gonna have to side with pat on this one. check valve &gt; pcv.</p><p>I also realized that because this closes under boost it will work for my boring stock 1.6 all the way up to a big high boost build.</p><p>You just need to vent the other side properly.</p>
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Old 09-02-2015, 03:54 AM   #66
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bbundy puts a crank vent in his car to help with blowby blowing oil trying to return in the drains back up and into the head, causing oil to pool and in turn causing it to get sucked out the PCV side port because the drain and air channel hole by the baffle is literally in the back corner, I mean really Mazda? Ya couldn't put a small baffle chamber in the middle and put the port up there? Would avoid half of all of this problem.

There's a raised drain hole in that back corner that's supposedly for crank pressure to return bypassing the oil return; it's offset a quarter inch in my head inboard, about 2" down, I'm guessing to make room for something else in the casting, but otherwise is 1/2" in diameter.



Oh, Aidan. Next time you pull your VC just drill the hole connecting the middle baffle chamber to the exhaust side port. It's only a 1/4" hole that I drilled in small steps up to 29/64" which should be plenty large enough for what's needed to vent.
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Old 09-02-2015, 04:01 AM   #67
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Im not worried about the drilling. I just don't want to pull my valve cover.
<br />
<br />Next engine will probably have all those holes drilled out, and some fat hose on the exhaust side, maybe a slashcut to the downpipe.
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Old 09-02-2015, 04:43 AM   #68
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Also, Bob had issues with that. Big puffs of smoke.
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Old 09-02-2015, 06:08 AM   #69
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You say you have a problem with puffs of smoke, yet you say slashcut? We all know those make smoke, right?

I also don't see how Bob's setup like above could puff smoke, doesn't look like he vents the can to the intake manifold at all. Are you sure he wasn't just filling the can?

Bob has no need of PCV, he is in boost more often than not. I can't imagine him using PCV.
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Old 09-02-2015, 09:50 AM   #70
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The slashcut was pulling oil up from the catch can. And I mean PUFFS of smoke
<br />
<br />
<br />
<br />Slash cut is to pit vacuum on the crankcase while under load.
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Old 09-02-2015, 03:45 PM   #71
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He deleted the PCV hose and it resolved a lot of that issue if I recall correctly. The shitty baffles there make it real easy to suck out volumes of oil in short order especially on hard lefts.
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Old 09-02-2015, 03:58 PM   #72
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Quote:
Originally Posted by deezums View Post
You say you have a problem with puffs of smoke, yet you say slashcut? We all know those make smoke, right?

I also don't see how Bob's setup like above could puff smoke, doesn't look like he vents the can to the intake manifold at all. Are you sure he wasn't just filling the can?

Bob has no need of PCV, he is in boost more often than not. I can't imagine him using PCV.
Total guess on my part, but I would guess he had something connected to the intake manifold to allow it to smoke that much. That, or a slash cut in the exhaust, but my guess is on intake manifold.
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Old 09-02-2015, 05:13 PM   #73
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<p>Do you guys not read what I post. 2 posts ago I said that the slashcut was pulling oil from the can.</p>
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Old 09-02-2015, 05:28 PM   #74
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for some reason, I couldn't help but giggle when I saw the poof of oil
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Old 09-02-2015, 05:29 PM   #75
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<p>I thought it was awesome. I want that on mine.</p><p>SMOKE SCREEN!!!!</p>
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Old 09-04-2015, 12:26 PM   #76
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Quote:
Originally Posted by aidandj View Post
<p>Other side is open to a little filter.</p><p>Check valve = pcv.</p><p>Check valve $</p><p>PCV $$$</p>
a pcv CAN work as a check valve, however, the plunger doesn't always seal with pressure behind it. plus a pcv can allow airflow in either direction depending on the conditions.

a check valve is one way only.



also: do a leakdown test.

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Old 09-07-2015, 01:07 PM   #77
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Old 09-07-2015, 01:19 PM   #78
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Only good to 100psi, not worth it.
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Old 09-07-2015, 01:20 PM   #79
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Wouldn't there be a pressure drop across that filter though, as in, it could cause measurable back pressure?
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Old 09-07-2015, 05:06 PM   #80
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Quote:
Originally Posted by good2go View Post
Wouldn't there be a pressure drop across that filter though, as in, it could cause measurable back pressure?
If you look at the specs compared to the one Aidan and deezums are using, it flows almost 3 times as much, but only filters to 40 microns, vs 5.

I ordered 2 this morning, and 3 check valves, ill let you gheys know how it works.
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